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Finding the Fourth Proportional to 439.46, 660.22 and 256.98

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Solution

The fourth proportional to 439.46, 660.22 and 256.98 is: 386.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.46 : 660.22 = 256.98 : x
  2. Step 2: Convert to fraction form
    439.46/660.22 = 256.98/x
  3. Step 3: Cross multiply
    439.46x = 660.22 × 256.98
  4. Step 4: Simplify right side
    439.46x = 169,664.44
  5. Step 5: Solve for x
    x = 169,664.44/439.46
  6. Step 6: Final answer
    x = 386.07

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.